Phenylene-bis-dithiocarbamic acid esters

ABSTRACT

Anthelmintically active phenylene-bis-dithiocarbamic acid esters of the formula IN WHICH R1 and R2 are equal or different and represent hydrogen, halogen, alkyl or alkoxy having from one to six carbon atoms and R3 is pyridyl, quinolyl or isoquinolyl which may be substituted by one or more alkyl radicals having from one to six carbon atoms. A process for their preparation.

United States Patent Schorr et al. 45 July 11, 1972 [54] PHENYLENE-BIS-DITHIOCARBAMIC [56] References Cited ACID ESTERS UNITED STATES PATENTS 72 Inventors: Manfred Schorr F ankfurt M Walt 1 Durckheimer, heim/Mzfi n 3,579,525 5/1971 Tilles et al. ..2e0/294.s E

Behrendt, Konigstein/Taunus; Dieter Du- Primary xammer-Alan L. Rotman HOfheIm/Taunus' of Germany Attorney-Curtis, Morris and Safford [73] Assignee: Farbwerke Hoechst Aktiengesellschalt vormals .Meister Lucius 8: Brunlng, Frank- [57] ABSTRACT fun/am Mam-Hoechst, Germany I Amhelmintically active phenylene-bis-dithiocarbamic acid [22] Filed: Sept. 8, 1970 esters of the formula [2]] Appl. No.: 70,485 8 NH-(fi-S-CH1R5 v Rr-CHg--S-3NH S [30] Foreign Application Priority Data Sept. 20, 1969 Germany ..P 19 47 746.4 m

in which R and R are equal or different and represent [5 2] U.S. Cl. .l260/294.8 E, 260/287 R, 424/258, hydrogen, halogen, alkyl or alkoxy having from one to six car- 424/266 bon atoms and R is pyridyl, quinolyl or isoquinolyl which may [51] Int. Cl. ..C07d 31/50 be substitutedby. one or more alkyl radicals haying from one [58] Field of Search ..260/294.8 E to six carbon atoms. A process for their preparation.

7 Claims, No Drawings PHENYLENE-BlS-DITHIOCARBAMIC ACID ESTERS The present invention relates to bis-dithiocarbamic acid esters of the general formula I Br I in which R and R are equal or different and represent hydrogen, halogen, alkyl or alkoxy having from one to six carbon atoms and R is pyridyl, quinolyl or isoquinolyl which may be substituted by one or more alkyl radicals having from one to six carbon atoms.

The present invention further relates to a process for the preparation of the said compounds which comprises reacting a water-soluble salt of a bis-dithiocarbamic acid of the Formula s s-li-NHQ g in which X95 represents one cation-equivalent, with a reactive ester of an alcohol of the Formula 111 R -CH -Ol-l III.

By the term relative esters" there are understood especially chlorides, bromides and iodides, further, for example, sulfonates, methylsulfonates (mesylates) and toluenesulfonates (tosylates). The following substances may thus be used as starting materials: 2-chloromethylpyridine, 2- bromomethylpyridine, 2-iodomethylpyridine, 3-chloromethylpyridine, 3-bromomethylpyridine, 4-chloromethylpyridine, 2- chloromethyl-4-methylpyridine, 2-chloromethyl-6-methylpyridine, 2-chloromethyl-4, 6-dirnethylpyridine, 2- chloromethyl-4, 5-dimethylpyridine, 6-ethyl-2-chloromethylpyridine, 2-tosyloxymethylpyridine, 3-mesyloxymethylpyridine, Z-hydroxysulfonyloxypyridine, 2-chloromethy1quinoline, 2-bromomethylquinoline, 3-chloromethylquinoline, 4- chloromethylquinoline, l-chloromethylisoquinoline, 3- chloromethylisoquinoline, 4-ch1oromethylisoquinoline, lchloromethyl-4-methylisoquinoline. These compounds are advantageously used as hydrochlorides and, at the beginning of the reaction, set free by addition of the equivalent amount of base.

The salts of the phenylene-bis-dithiocarbamic acid esters of the formula 11 can be obtained by the method described by van der Kerk et a1. (Rec. 74, 1268 (1955)). Advantageously, the alkaline, alkaline earth or ammonium salts as well as the salts of organic bases, especially tertiary amines, are used.

The reaction is advantageously carried out as follows: a compound of the formula III dissolved in a water-miscible sol vent, for example acetone, alcohol, tetrahydrofurane, dioxane, acetonitrile, formamide, dimethylformamide, or dimethylsulfoxyde, is added to the aqueous solution of a phenylene-bis-dithiocarbamate. The reaction product, which precipitates after a short time, is separated and purified by washing or reprecipitating from suitable solvents. According to another operation mode, it is also possible to prepare in situ the phenylene-bis-dithiocarbamate from the corresponding phenylenediamine, carbon disulfide and alkali or ammonia and then to react it immediately with a halogen derivative of a compound of the formula III. The reaction temperature should be between at out 0 and 60 C, room temperature being preferred.

The phenylene-bis-dithicarbamic acid esters of the present invention are chemotherapeutically active and suitable for fighting helminthic diseases in mammals. They are especially active against several species of cat liver fluke (Opisthorchis felineus, Opistharchis viverim', Clonorchis sinensis), and against Liver fluke diseases are an important problem in many countries of Asia.

The chemotheraperitic tests were carried out using gold hamsters which had been infected with Opisthorchis felineus'. The examined compounds were applied orally to the animals for 3 to 5 consecutive days (once each day). The success of the treatment was judged by examination of the excrements for egg-secretion as well as by dissection.

The following Table 1 lists the therapeutic results obtained with a number of compounds prepared:

Table I Preparation Maximum tolerable Curative dose dose (mg/kg gold (mg/kg mouse), hamster).

orally orally Example 1a 6000 3 i 50 Example 1c 3200 3 X 50 Example 1d 3200 3 X 50 Example 1e 3000 3 X 50 Example 1] 800 3 X 50 Example 20 1500 3 X 50 EXAMPLE 1 a. 1,4-Phenylene-bis-dithicarbamic acid pyridyI-Z-methyl ester.

A solution of 32.8 g of 1 2-chloromethylpyridinehydrochloride and 20 g of sodium bicarbonate in 200 cc. of acetone/water 121 was added, at room temperature, while stirring, to a solution of 29.5 g (0.1 mol) of ammonium salt of 1,4- phenylene-bis-dithiocarbamic acid in 1.5 l of water. The reaction product precipitated rapidly and was suction-filtered after. about 30 minutes, thoroughly washed with water and acetone and dried in vacuo over sulfuric acid. 29.6 g (67 percent) of l,4-phenylene-bis-dithiocarbamic acid pyridyl-2-methyl ester having a decomposition point beginning at C were ob tained.

Quantitative Analysis: C H N S, (m.w. 442.7) Calculated: C 54.26 H 4.10 N 12.66 8 28.97 Found: C 54.3 H 4.1 N 12.9 S 27.5

In an analogous manner there were obtained:

b. Z-Methyl-l ,4-phenylene-bis-dithiocarbamic acid pyridyl- 2-methyl ester, decomposition beginning at 127 C.

c. Z-Methoxy-l,4-pheny1ene-bis-dithiocarbamic acid pyridyI-Z-methyl ester, decomposition beginning at 135 C.

d 2,5-Dimethyl-1,4-phenylene-bis-dithiocarbamic acid pyridyl-S-methyl ester, decomposition beginning at C.

e. 1,4-Phenylene-bis-dithiocarbamic acid pyridy1-3-methyl ester, decomposition point: 179l 81C.

f. 2-Methyl-l,4-phenylene-bis-dithiocarbarnic acid pyridyl- S-methyl ester, decomposition point: l67-170 C.

g. 1,4-Phenylene-bis-dithiocarbamic acid pyridyl-4-methyl ester, decomposition beginning at 179 C.

h. 2-Methyl-l,4-phenylene-bis-dithiocarbamic acid-(5- methylpyridyl-2-)-methyl ester, decomposition point: 13l-1 which up to now no specific chemotherapeutic agent exists. 75 35C.

i. 2,5-Dimethyl-1,4-phenylene-bis-dithiocarbamic acid pyridyl-Z-methyl ester, decomposition point: l50-l 52 C.

EXAMPLE 2 a. l,3-Phenylene-bis-dithiocarbamic acid pyridyl-Z-methyl ester.

21.6 g (0.2 mol) of 1.3-phenylene-diamine were suspended in a mixture of 93 cc. of concentrated ammonia and 26 cc. of water, and 27 cc. of carbon disulfide were added, while stirring, at 30 C. After 2 '15 hours of stirring at room temperature, the precipitated ammonium salt of 1,3-phenylene-bisdithiocarbamic acid was suction-filtered, washed with a little amount of water and acetone and dried at the air. The yield was 44 g (75 percent).

29.4 g (0.1) mol of the ammonium salt of 1,3-phenylenebis-dithiocarbamic acid were dissolved in 500 cc. of water, and a solution of 32.8 g of 2-chloromethyl-pyridinehydrochloride and 20 g of sodium bicarbonate in 200 cc. of acetone/water 1:1 was added, while stirring, at room temperature. The reaction product precipitated rapidly and, after 1 hour of stirring and cooling, the product was suction-filtered, thoroughly washed with water and acetone and dried in vacuo. 26.5 g (60 percent) of 1,3-phenylene-bis-dithiocarbamic acid pyridyl- 2-methyl ester were obtained; decomposition point:

Quantitative Analysis: C H N S (m.w. 442.7) Calculated: C 54.26 H 4.10 N 12.66 S 28.97 Found: C 54.3 H 4.2 N 13.3 S 27.9

In an analogous manner there were obtained:

b. 1,3-Phenylene-bis-dithiocarbamic acid-(o-methylpyridyl)-2-) methyl ester, decomposition point: l32-134 C.

c. SMethoxy-l ,3-phenylene-bis-dithiocarbamic acid pyridyl-2-methyl ester, decomposition point: l38-144 "C.

d. 1,3-Phenylene-bis-dithiocarbarnic acid pyridyl-3-methyl ester, decomposition beginning at 150 C.

EXAMPLE 3 a. 1,3-Phenylene-bis-dithiocarbamic acid quinolyl-Z-mthyl ester.

7.35 g (0.025 mol) of the ammonium salt of 1,3-phenylene- Quantitative analysis: C, H,,N S (m.w. 542.8) Calculated: 61.97 H 4.09 N 10.32 S 23.64 Found: C 61.9 H 4.1 N 10.6 S 23.4

In an analogous manner there was obtained:

b. 2-Methyl-l ,4-phenylene-bis-dithiocarbamic acid quinolyl-2-methyl ester, decomposition beginning at 133 C.

What is claimed is:

l. Bis-dithiocarbamic acid esters of the Formula 1 in which R and R, are equal or different and represent hydrogen, halogen, alkyl or alkoxy having from one to six carbon atoms, and R, is pyridyl, which may be substituted by one or more alkyl radicals having from one to six carbon atoms.

2. 1,4-Phenylene-bis-dithiocarbamic acid pyridyl-2-methyl ester.

3. 2-Methoxy-l,4-phenylene-bis-dithiocarbamic acid pyridyl-Z-methyl ester.

4. 2,5Dimethyl-l,4-phenylene-bis-dithiocarbamic acid pyridyl-S-methyl ester.

5. 1,4-Phenylene-bis-dithiocarbamic acid pyridyl-3-methyl ester.

6. 2Methyl-1,4-phenylene-bisdithiocarbamic acid pyridyl- 3- methyl ester.

7. l,3-Phenylene-bis-dithiocarbamic acid pyn'dyl-Z-methyl ester. 

2. 1,4-Phenylene-bis-dithiocarbamic acid pyridyl-2-methyl ester.
 3. 2-Methoxy-1,4-phenylene-bis-dithiocarbamic acid pyridyl-2-methyl ester.
 4. 2,5Dimethyl-1,4-phenylene-bis-dithiocarbamic acid pyridyl-3-methyl ester.
 5. 1,4-Phenylene-bis-dithiocarbamic acid pyridyl-3-methyl ester.
 6. 2-Methyl-1,4-phenylene-bis-dithiocarbamic acid pyridyl-3-methyl ester.
 7. 1,3-Phenylene-bis-dithiocarbamic acid pyridyl-2-methyl ester. 